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22                                 CHEMICAL ENGINEERING
STEAM SUPERHEATED 150F.   BACK PRESSURE, 2 LB. ABS.
	Absolute steam pressure, pounds per square inch				
Ratio of	70	100	130	160	215
expansion					
	Steam consumption, pounds per indicated horsepower per hour				
5	12.0	11.5	11.3	11.0	
7	11.2	10.6	10.4	10.1	9.8
10	10.5	10.0	9.6	9.4	9.1
15	10.1	9.4	9.0	8.8	8.5
20	10.0	9.1	8.7	8.4	8.1
25	9.9.	9.1	8.6	8.3	7.9
30	9.8	9.0	8.5	8.2	7.9
40			8,5	8.1	7.8
(From MARKS' Mechanical Engineers' Handbook)
STEAM SUPERHEATED 150F.   BACK PRESSURE, 16 LB. ABS.
Absolute steam pressure, pounds per square inch
Ratio					
of	70	100	130	160	215
expansion					
	Steam consumption, pounds per indicated horsepower per hour				
2	22.9	19 7	18.1	17.1	16.5
3	20.8	17.6	16.1	15.1	14.6
4		17.0	15.1	14.2	13.4
5			15.0	13.8	12.6
6				13.7	12.3
					12.1
(From MARKS' Mechanical Engineer^ Handbook)
TYPICAL STEAM RATES  (LB. PER I.Hp.-Hn.) WITH VARIOUS VALVES
TYPE OF ENGINE Simple non-condensing ........	SINGLE VALVE 33	DOUBLE VALVE 30	FOUR VALVE 29	RELEASING 26
Simple condensing.	27	23		21 IX
Compound non-condensing ......		23	22	22
Compound condensing ......	20	17	15	15
				
Average ............	26%	23^	21%	21 L
Progressive saving, per cent ......		12	7	3
(From MARKS' Mechanical Engineers1 Handbook)